KR20170135558A - Method for manufacturing double bottom panel using recycled waste plastic - Google Patents

Abstract

The present invention relates to a method of manufacturing a double floor panel for building by recycling a waste synthetic resin. The method of the present invention comprises: a grinding step of grinding a collected waste synthetic resin; an additive injection step of 40 to 45 parts by weight of Calpet and 15 to 20 parts by weight of glass powder per 100 parts by weight of the ground material into a ground material obtained through the grinding step; an intermediate material forming step of blending a mixture having the additive injected thereinto, and extruding the blended mixture through an extruding device to obtain a chip type intermediate material; a foaming agent injection step of adding a foaming agent to the intermediate material obtained through the intermediate material forming step such that 5 to 10 parts by weight of the foaming agent are injected into 100 parts by weight of the intermediate material to mix the foaming agent with the intermediate material; and a panel molding step of injection molding a mixture of the intermediate material and the foaming agent obtained through the foaming agent injection step using an injection mold to manufacture the double floor panel. The method according to the present invention can provide a double floor panel which has excellent load resistance, is free from contraction during using of the double floor panel, and has good flame retardancy accordingly by injecting inorganic fillers such as Calpet and glass powder into the waste synthetic resin as a raw material, blending the inorganic fillers with the waste synthetic resin to primarily heat and extrude a blended material to obtain an extrudate, injecting the foaming agent into the extrudate to blend the extrudate with the foaming agent, secondly heating and pressurizing a blended material, and injection molding the heated and pressurized material, thereby enabling the a double floor panel to have compact structure and uniform internal density.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a dual floor panel for recycling waste synthetic resin,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double floor panel disposed on a slab of each floor during the construction of a building, and more particularly, to a method for manufacturing a dual floor panel for construction using recycled waste synthetic resin as a main material.

In the case of an apartment building or an office building recently built, a separate double floor panel is placed on a slab dividing each floor, and mortar is covered thereon or floor finishing material is laid on the floor to make the floor space as a whole thick, So-called double bottom method is applied. The double floor system constructed by this double floor method can effectively block the noise, vibration and heat transfer between the floors.

The above-mentioned double floor panel has a wide variety of types depending on the structure and functions thereof, and most of them are formed by injection molding of synthetic resin. That is, the prepared synthetic resin material is melted and pressed into the injection mold to produce a product having a desired shape.

However, after completion of the building, the above-mentioned double floor panel receives a continuous concentrated load and a distributed load by various heavy loads of the room such as a bed, a refrigerator, a piano or a desk, and receives a frequent impact load according to the movement of a resident , And should have excellent load-bearing capacity to withstand these various loads.

If the double floor panel can not overcome the load, buckling deformity or breakage may cause the floor of the room to tilt, resulting in a considerable decrease in the residence, and in the case of, for example, a refrigerator, a bookcase, or a wardrobe,

For this reason, the load-bearing capacity of the double-bottom panel is a very important design issue. In addition to the optimum structure design for it, it is necessary to increase the injection pressure or to increase the injection pressure during injection molding. Do not leave.

However, when the injection pressure is maintained at a high pressure in order to maximize the density of the double bottom panel, the consumption of the raw material of the synthetic resin as the raw material is large and the injection apparatus is excessively loaded. This causes a rise in the production cost of the double floor panel and increases the construction cost.

On the other hand, the amount of waste synthetic resin that is abandoned in proportion to the increase of population and the increase of synthetic resin consumption due to industrial development is also continuously increasing. These waste synthetic resins have not been decomposed even after several decades, and proper treatment measures have been required as pollutants that pollute soil or ground water.

However, these waste synthetic resins cause environmental loads as serious pollutants, but when reclaimed thoroughly, they give a positive benefit of regeneration of waste resources.

As a method for recycling waste synthetic resin as described above, a method for manufacturing a dual flooring for construction using waste paper and waste plastics (Korean Patent Registration No. 10-0591140) has been disclosed.

The manufacturing method includes a process of mixing waste paper containing discarded paper money with waste plastic, extrusion molding, and pressing and cooling the formed extrudate to shrink it and to process the surface.

However, since the flooring material produced by the above-described manufacturing method uses waste paper as a filler, it has been troublesome to perform additional processes for reinforcing strength and preventing shrinkage during production.

For example, since the extruded molded product after mixing waste paper and waste plastic has poor strength, extruded plate-like extrudate is cut to a predetermined size in order to reinforce the strength, and the extruded product is put into a press, It is necessary to perform the process of pressurization.

In addition, since the inside of the pressed moldings contains waste paper components, there is a possibility of shrinkage even when pressed with a strong pressure, so that it is troublesome to perform cooling treatment by immersing in cold water in a fixed mold during the manufacturing process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method for manufacturing a molded product by injecting and mixing an inorganic filler such as CALPET and glass powder into a waste synthetic resin, Molded by recycling the waste synthetic resin to obtain a double floor panel having a structure that is dense, uniform in internal density and excellent in load-bearing property and has no fear of shrinkage during use and has excellent flame retardancy And to provide a method for manufacturing a dual floor panel.

According to another aspect of the present invention, there is provided a method for manufacturing a dual floor panel for construction, the method comprising: a pulverizing step of pulverizing the collected waste synthetic resin; An additive including CALPET and glass powder is added to the pulverized product obtained by the pulverization step, and 40 to 45 parts by weight of calpette and 15 to 20 parts by weight of glass powder are added per 100 parts by weight of the pulverized product Adding an additive; An intermediate material forming step of mixing an additive-added mixture and extruding the mixture through an extruder to obtain a chip-shaped intermediate material; Adding a foaming agent to the intermediate material obtained through the intermediate material forming step, and adding 5 to 10 parts by weight of a foaming agent per 100 parts by weight of the intermediate material; And a panel molding step of preparing a dual floor panel by injection molding an intermediate material and a mixture of the foaming agent obtained through the step of injecting the foaming agent using an injection mold.

The waste synthetic resin pulverized product obtained through the pulverizing step has a size capable of passing through a through hole having an inner diameter of 10 mm.

The intermediate material forming step includes cutting a linear extruded material extruded from the extruding device, and the intermediate material obtained through the cutting has a size capable of passing through a through hole having an inner diameter of 5 mm do.

In addition, the glass powder has a particle size of 50 mesh or less.

The method for manufacturing a dual floor panel for construction, which recycles the waste synthetic resin of the present invention as described above, comprises the steps of charging and mixing an inorganic filler such as CALPET and glass powder into a waste synthetic resin as a raw material, The present invention provides a double floor panel which has excellent structure with high density, uniform load-bearing property, no shrinkage during use, and excellent flame retardancy because the foamed material is put into the extruded material, I will.

1 is a block diagram illustrating a method for manufacturing a dual floor panel for construction using recycled waste synthetic resin according to an embodiment of the present invention.

Hereinafter, one embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Basically, the double floor panel manufactured by the dual floor panel manufacturing method according to the present embodiment is formed through two heating and pressing processes, so that the structure is very dense and the density distribution in the finished product is uniform, And stress concentration phenomenon does not occur, so that it is characterized not only in safety but also in load resistance.

1 is a block diagram illustrating a method for manufacturing a dual floor panel for construction using recycled waste synthetic resin according to an embodiment of the present invention.

As shown in the figure, the method for manufacturing a dual floor panel for construction using recycled waste synthetic resin according to the present embodiment includes a waste synthetic resin preparing step 101, a crushing step 103, an additive adding step 105, A foaming agent injecting step 111, a secondary compounding step 113, a panel forming step 115 and a post-processing step 117. The step 107, the intermediate material forming step 109, the foaming agent injecting step 111,

First, the waste synthetic resin preparation step 101 is a process of sorting and cleaning the waste plastic material in a state that can be recycled, among the waste synthetic resins collected separately. The waste material may include, for example, a packaging material, a vinyl cover, various coating materials, an infant toy, a beverage bottle, a wire coating, an electrical insulating material, a hose, a kitchen container, agricultural plastics and the like.

If the waste synthetic resin to be used is prepared through the waste synthetic resin preparation step 101, the waste synthetic resin is subjected to a pulverization step 103 for pulverizing the pulverized synthetic resin. A conventional grinding apparatus can be used as the grinding apparatus. The waste synthetic resin is finely crushed through the crushing step (103) to have a certain size.

The size of the pulverized pulverized product through the pulverization step 103 may be varied as required, for example, the pulverized product may have a maximum diameter of 10 mm or less. A maximum diameter of 10 mm or less means, for example, a size capable of passing through a through hole having an inner diameter of 10 mm.

The size of the pulverized product may vary as much as possible. For example, the maximum diameter may be subdivided to about 1 mm, or it may be made in powder form. In contrast, it is of course possible to cut the maximum diameter larger than 10 mm.

If the waste synthetic resin is pulverized to a required size through the pulverization step (103), an additive injection step (105) is continued.

The additive injecting step 105 is a process of injecting CALPET and glass powder into the waste synthetic resin pulverized product. The amount of the calc pet is 40 to 45 parts by weight per 100 parts by weight of pulverized waste synthetic resin. The amount of the glass powder to be added is 15 to 20 parts by weight per 100 parts by weight of pulverized waste synthetic resin. It is needless to say that the input ratio of the calcite and the glass powder to the pulverized material may be varied as necessary.

The additive injecting step 105 is carried out inside a blender (not shown) for blending the glass powder with the calcite for the milled product. That is, in the state in which the pulverized material is transferred to the blending container in the blender, the calette PET and the glass powder are put into the blending container.

The calettep is a plastic extender prepared by adding a thermoplastic resin, a dispersant, an antioxidant, a heat stabilizer, etc. to calcium carbonate (CaCO3), which is an inorganic chemical, and melting it. When the calettep is added as an additive during plastic molding, it is possible to obtain the effect of improving the flame retardancy and the load-carrying capacity as well as the heat resistance and rigidity of the molded product. These calf pets are purchased and used on the market.

The glass powder is obtained by pulverizing and pulverizing various collected waste glass, and its particle size is about 50 mesh. The particle size of the glass powder depends on the required properties of the product to be produced.

As is well known, a huge amount of waste glass generated in Korea causes various environmental problems due to the shortage of landfill. However, by using waste glass as a raw material of the double floor panel as in the present embodiment, It is possible to reduce the unit cost and reduce the pollution of the environment.

In any case, the glass powder undergoes an extrusion and injection process in a state of being mixed with the crushed material and the calette, and serves to enhance the strength of the product evenly distributed inside the final product.

The subsequent primary blending step 107 is a process of evenly mixing the milled material, the calette material and the glass powder in a blending container. The primary compounding step 107 may proceed for 10 to 30 minutes.

If the mixture of the crushed material, the calette material, and the glass powder is sufficiently mixed through the first mixing step 107, the intermediate material forming step 109 is performed. The intermediate material forming step (109) is a hot extrusion process in which the mixture after completion of the first mixing step is placed in an extruder and heated and extruded to make an intermediate material in the form of a chip. As described above, the manufacturing method according to the present embodiment includes two heating and pressing processes, and the intermediate material forming process 109 is a primary heating and pressing process.

The intermediate material extruded through the extrusion process is extended in the longitudinal direction in the same manner as in general extrusion, but is cut at regular intervals through a separate cutting process in this embodiment. And a chip-shaped intermediate material is obtained through the cutting process.

The intermediate material has a hard and homogeneous structure in which the molten synthetic resin pulverized product, the calettep and the glass powder are uniformly mixed. The size of the intermediate member is in the form of a cylinder having a diameter and a height of about 5 mm.

If the intermediate material is formed through the intermediate material forming step 109, a step of injecting a foaming agent into the intermediate material is performed (step 111). The charging ratio of the foaming agent to the intermediate material is 5 to 10 parts by weight per 100 parts by weight of the intermediate material. However, the amount of the blowing agent may vary depending on the need.

The foaming agent, as an inorganic chemical foaming agent, is mixed with an intermediate material in the subsequent panel forming step 115 and is thermally decomposed to form a micro foam structure. The micro-expanded structure provides high elasticity, durability, load-bearing property, thermal insulation, soundproofing and buffering effect, and also maintains shrinkage and flatness of the product.

The blowing agent injecting step 111 is performed in a compounding cylinder (not shown) of the compounding machine in the same manner as the additive adding step 105. That is, after the intermediate material is put into the blending container, the foaming agent of an appropriate weight ratio is added according to the weight of the intermediate material.

After the foaming agent injecting step 111 is completed, the second mixing step 113 is performed. The second compounding step 113 is a process of rotating the compounding vessel to uniformly mix the intermediate material and the foaming agent, and may proceed for about 10 to 30 minutes.

If the intermediate material and the foaming agent are evenly mixed through the second mixing step 113, the panel forming step 115 is performed. This is the second heating and pressing process during the above two heating and pressing processes.

The panel forming step 115 is a process of melting and injecting the intermediate material and the foaming agent mixture into the injection mold. The mixture injected into the injection mold in the molten state fills the inner space of the injection mold and has the shape of a double bottom panel.

If the panel molding step 115 is completed, the injection molding is taken out of the mold and then the post-processing step 117 is performed. The post-treatment step 117 may include a step of examining whether or not the molding material just finished injection molding is abnormal.

On the other hand, as mentioned above, the double floor panel manufactured by the manufacturing method according to the present embodiment is particularly excellent in the load-bearing property, and this fact can be confirmed through the following test report.

As described in the test report, the compressive load test result is 21099N (Newton), which is seven times higher than the reference value of 3000N. Despite the use of waste materials, it has a very high load-bearing capacity.

The test result is a load value measured when a double floor panel is compressed by 4 mm using an universal testing machine, and is also a reaction force of the double floor panel.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

101: waste synthetic resin preparing step 103: crushing step
105: Additive Addition Step 107: Mixing Step
109: Extrusion and chip forming step 111: Step of injecting foaming agent
113: mixing step 115: injection molding step
117: Post-processing step

Claims (4)

A pulverizing step of pulverizing the collected waste synthetic resin;
An additive including CALPET and glass powder is added to the pulverized product obtained by the pulverization step, and 40 to 45 parts by weight of calpette and 15 to 20 parts by weight of glass powder are added per 100 parts by weight of the pulverized product Adding an additive;
An intermediate material forming step of mixing an additive-added mixture and extruding the mixture through an extruder to obtain a chip-shaped intermediate material;
Adding a foaming agent to the intermediate material obtained through the intermediate material forming step, and adding 5 to 10 parts by weight of a foaming agent per 100 parts by weight of the intermediate material;
And a panel molding step of forming a dual floor panel by injection molding an intermediate material and a mixture of the foaming agent obtained through the step of injecting the foaming agent using an injection mold. The method according to claim 1,
Wherein the pulverized synthetic resin pulp obtained through the pulverizing step has a size capable of passing through a through hole having an inner diameter of 10 mm. The method according to claim 1,
Wherein the intermediate material forming step includes cutting a linear extruded material extruded from the extruding device and the intermediate material obtained through cutting has a size capable of passing through a through hole having an inner diameter of 5 mm. A method for manufacturing a dual floor panel for construction using recycled resin. The method according to claim 1,
Wherein the glass powder has a particle size of 50 mesh or less. ≪ RTI ID = 0.0 > 8. < / RTI >

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